MySQL最大和最小子查询使用日期范围

Question

我有以下查询：

SELECT
(Date + INTERVAL -(WEEKDAY(Date)) DAY) `Date`,

我想在此处使用子查询从最大日期和最小日期获取最旧和最新的库存：

(select sellable from clabDevelopment.fba_history_daily where Date = max(Date))

max(Date), min(Date),
ASIN, 
ItemSKU, 
it.avgInv,
kt.Account, kt.Country, SUM(Sessions) `Sessions`, avg(Session_Pct)`Session_Pct`, 
sum(Page_Views)`Page_Views`,  avg(Page_Views_Pct)`Page_Views_Pct`,  avg(Buy_Box_Pct)`Buy_Box_Pct`, 
sum(Units_Ordered)`Units_Ordered`, sum(Units_Ordered_B2B) `Units_Ordered_B2B`,  
avg(Unit_Session_Pct)`Unit_Session_Pct`, avg(Unit_Session_Pct_B2B)`Unit_Session_Pct_B2B`,
sum(Ordered_Product_Sales)`Ordered_Product_Sales`, sum(Total_Order_Items) `Total_Order_Items`, sum(Actual_Sales) `Actual_Sales`,  
 sum(Orders) `Orders`, sum(PPC_Revenue) `PPC_Revenue`, sum(PPC_Orders) `PPC_Orders`,
sum(Revenue)`Revenue`,  sum(Sales_Tax_Collected) `Sales_Tax_Collected`,  sum(Total_Ad_Spend) `Total_Ad_Spend`, sum(Impressions) `Impressions`, 
 sum(Profit_after_Fees_before_Costs) `Profit_after_Fees_before_Cost`
FROM clabDevelopment.KPI_kpireport as kt

left outer join 
(SELECT Month(Date) as mnth, sku, account, country, avg(sellable)`avgInv` FROM clabDevelopment.`fba_history_daily`
where sellable  >= 0
group by Month(Date), sku, account, country) as it
on kt.ItemSKU = it.SKU
and kt.Account = it.account
and kt.Country = it.country
and it.mnth = Month(kt.Date)
WHERE kt.Country = 'USA' or kt.Country = 'CAN'
GROUP BY Account, Country,(Date + INTERVAL -(WEEKDAY(Date)) DAY), ItemSKU
ORDER BY Date desc

子查询将来自我在底部加入的同一表中，除了我按月分组。 所以我想运行此子查询并获取max（Date）日期的sellable下的值：

(select sellable from clabDevelopment.`fba_history_daily where Date = max(Date))

当我这样做时，我会无效使用组功能。

Answer 1

在不了解您的架构和引擎/数据库的情况下，很难理解该问题。 但是，以下模式是最好的猜测：

fba_history_daily
- mnth
- sku
- account
- country
- sellable
- SKU

KPI_kpireport
- Account
- Country
- ItemSKU
- Account
- Date
- Country
- ASIN

以下查询将为您提供所需的信息。 这使用GROUP_CONCAT以便通过聚合构建所需的结果。 使用嵌套查询联接，MySQL可能会在内存中建立一个临时表来对那些记录进行排序，这不是最佳的。 您可以使用EXPLAIN进行检查，详细信息中将看到Using temporary的。

SELECT
  (Date + INTERVAL -(WEEKDAY(Date)) DAY) `Date`,
  ASIN, 
  ItemSKU, 

  -- MIN
  (SUBSTRING_INDEX(GROUP_CONCAT(it.sellable ORDER BY it.Date ASC),',', 1) AS minSellable),

  -- MAX
  (SUBSTRING_INDEX(GROUP_CONCAT(it.sellable ORDER BY it.Date DESC),',', 1) AS maxSellable),

  -- AVG
  AVG(it.sellable) avgInv,

  kt.Account, kt.Country, SUM(Sessions) `Sessions`, avg(Session_Pct)`Session_Pct`, 
  sum(Page_Views)`Page_Views`,  avg(Page_Views_Pct)`Page_Views_Pct`,  avg(Buy_Box_Pct)`Buy_Box_Pct`, 
  sum(Units_Ordered)`Units_Ordered`, sum(Units_Ordered_B2B) `Units_Ordered_B2B`,  
  avg(Unit_Session_Pct)`Unit_Session_Pct`, avg(Unit_Session_Pct_B2B)`Unit_Session_Pct_B2B`,
  sum(Ordered_Product_Sales)`Ordered_Product_Sales`, sum(Total_Order_Items) `Total_Order_Items`, sum(Actual_Sales) `Actual_Sales`,  
  sum(Orders) `Orders`, sum(PPC_Revenue) `PPC_Revenue`, sum(PPC_Orders) `PPC_Orders`,
  sum(Revenue)`Revenue`,  sum(Sales_Tax_Collected) `Sales_Tax_Collected`,  sum(Total_Ad_Spend) `Total_Ad_Spend`, sum(Impressions) `Impressions`, 
  sum(Profit_after_Fees_before_Costs) `Profit_after_Fees_before_Cost`

FROM KPI_kpireport as kt

left outer join fba_history_daily it on 
  kt.ItemSKU = it.SKU
  and kt.Account = it.account
  and kt.Country = it.country
  and Month(it.Date) = Month(kt.Date)
  and it.sellable  >= 0

WHERE kt.Country = 'USA' or kt.Country = 'CAN'
GROUP BY Account, Country,(Date + INTERVAL -(WEEKDAY(Date)) DAY), ItemSKU
ORDER BY Date desc